Techniques for phase modulated signals having poor autocorrelation
First Claim
1. An electronic sensing apparatus comprising:
- a modulator to phase modulate a carrier signal with a baseband signal using a phase modulation sequence, wherein the phase modulated signal has poor autocorrelation;
an emitter to emit the phase modulated signal; and
a receiver, wherein the receiver includesa collector to collect the emitted phase modulated signal, anda demodulator to demodulate the phase modulated signal into the baseband signal through poor cross-correlation with a mismatched filter, wherein the mismatched filter is based on the phase modulated sequence.
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Abstract
An electronic transmitter includes: a modulator to phase modulate a carrier signal with a baseband signal using a phase modulation sequence; and an emitter to emit the phase modulated signal. The phase modulated signal has poor autocorrelation, has a corresponding mismatched filter based on the phase modulation sequence, and is configured to demodulate into the baseband signal through poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a sensing apparatus, where the emitter emits the phase modulated signal at a target and the emitted signal reflects off the target. The sensing apparatus includes a receiver that has a collector to collect the reflected signal, and a demodulator to demodulate the collected signal into the baseband signal through the poor cross-correlation with the mismatched filter. Sometimes, the transmitter is part of a communication system, where the emitter emits the phase modulated signal to an intended recipient.
2 Citations
20 Claims
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1. An electronic sensing apparatus comprising:
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a modulator to phase modulate a carrier signal with a baseband signal using a phase modulation sequence, wherein the phase modulated signal has poor autocorrelation; an emitter to emit the phase modulated signal; and a receiver, wherein the receiver includes a collector to collect the emitted phase modulated signal, and a demodulator to demodulate the phase modulated signal into the baseband signal through poor cross-correlation with a mismatched filter, wherein the mismatched filter is based on the phase modulated sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of electronic sensing, the method comprising:
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phase modulating a carrier signal with a baseband signal using a phase modulation sequence by a modulator, wherein the phase modulated signal has poor autocorrelation; emitting the phase modulated signal using an emitter; collecting the emitted phase modulated signal using a collector; and demodulating, with a demodulator, the collected signal into the baseband signal through poor cross-correlation with a mismatched filter, wherein the mismatched filter is based on the phase modulated sequence. - View Dependent Claims (10, 11)
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12. An electronic receiver comprising:
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a collector to collect an emitted or reflected signal, wherein the emitted or reflected signal is from a phase modulated signal generated using a phase modulation sequence, and the phase modulated signal has poor autocorrelation, has a corresponding mismatched filter based on the phase modulation sequence, and is configured to demodulate into a baseband signal through poor cross-correlation with the mismatched filter; and a demodulator to demodulate the collected emitted or reflected signal into the baseband signal through the poor cross-correlation with the mismatched filter. - View Dependent Claims (13, 14)
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15. A method of phase modulation sequence generation using a processing circuit, the generated phase modulation sequence being a final phase modulation sequence used to phase modulate a carrier signal with a baseband signal to create a phase modulated signal having poor autocorrelation and a corresponding mismatched filter based on the phase modulation sequence, the phase modulated signal being configured to demodulate into the baseband signal through poor cross-correlation with the mismatched filter, the method comprising:
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generating, by the processing circuit, an initial phase modulation sequence having an initial autocorrelation sequence; iteratively adjusting, by the processing circuit, the initial autocorrelation sequence having an initial autocorrelation metric to a target autocorrelation sequence having a target autocorrelation metric corresponding to the poor autocorrelation; generating, by the processing circuit, an intermediate phase modulation sequence corresponding to the target autocorrelation sequence and based on the target autocorrelation metric; iteratively generating, by the processing circuit, next phase modulation sequences from the intermediate phase modulation sequence, the next phase modulation sequences corresponding to the target autocorrelation sequence and having corresponding autocorrelation metrics successively approaching the target autocorrelation metric; and outputting, by the processing circuit, a last of the next phase modulation sequences as the final phase modulation sequence when a last of the corresponding autocorrelation metrics is sufficiently close to the target autocorrelation metric. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification